Singapore confirmed 15 new cases of locally-transmitted Zika infections on Monday, taking the tally to 56 as authorities step up efforts to contain the outbreak.

All the cases were in or near the Aljunied area in the southeast of the city-state, and most were foreign workers from a nearby construction site owned by GuocoLand, where testing for the virus is now complete, the health ministry said in a statement.

The National Environment Agency (NEA) has inspected foreign workers’ dormitories as well as thousands of other premises in the area and in six other parts of the island.

Singapore, a major regional financial center and busy transit hub, which maintains a constant vigil against the mosquito-borne dengue virus, reported its first Zika case in May, imported by a middle-aged man who had been to Brazil. Continue reading.